What is a deflection wave?

A typical ECG tracing has 4 recognizable waves, called deflection waves. These waves are labeled alphabetically as the P wave, the QRS complex, the T wave, and the U wave. The first wave is called the P wave. It results from atrial muscle cell depolarization.

Why is it called the P wave?

His labeling of the primitive tracing was then mixed: A and B, the first letters of the alphabet, were used to indicate ventricular events, and P, from near the middle of the alphabet, was used to indicate atrial events.

Is P wave depolarization or repolarization?

The P wave represents the depolarization of the left and right atrium and also corresponds to atrial contraction. Strictly speaking, the atria contract a split second after the P wave begins. Because it is so small, atrial repolarization is usually not visible on ECG.

Is Primary wave also known as transverse wave?

P-Waves (Primary waves) are Longitudinal Waves. S-Waves (Secondary waves) are Transverse Waves.

Which of the following waves are also known as depolarization waves?

P wave
The P wave represents the wave of depolarization that spreads from the SA node throughout the atria, and is usually 0.08 to 0.10 seconds (80-100 ms) in duration.

What is the P wave QRS and T wave?

The QRS wave is produced by the atrioventricular node (AV). The P wave in an ECG complex indicates atrial depolarization. The QRS is responsible for ventricular depolarization and the T wave is ventricular repolarization.

What are P waves on an ECG?

The P wave indicates atrial depolarization. The P wave occurs when the sinus node, also known as the sinoatrial node, creates an action potential that depolarizes the atria. The P wave should be upright in lead II if the action potential is originating from the SA node.

Is Primary Wave also known as transverse wave?

Why is the T wave a positive deflection?

The T wave represents ventricular repolarization. Generally, the T wave exhibits a positive deflection. The reason for this is that the last cells to depolarize in the ventricles are the first to repolarize.